Hello, and Thank You for using Just Answer,
Position lights refers to the tail lamp parking light bulbs. One or more of them has likely failed. In each tail lamp, there are 2 parking light bulbs. Make certain to replace bulbs with ones of the same wattage, or it may still show a failure message. By the way, other messages you may see at some point are "brake bulb failure" as well as "dipped beam failure. Dipped beam refers to the low beam headlamps. Also, one things we've gotten into the habit of doing is replacing all 4 tail light park bulbs and both of the brake bulbs.
Let me know what you find, Thanks, Bill